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【简答题】
从Ⅱ栏中找出与Ⅰ栏相匹配的句子。 Ⅰ ( )1. Helen did badly in the math exam. ( )2. Wang Fang looks unhappy. ( )3. I moved to this new city this year. ( )4. I don't know how to solve this problem. ( )5. When something bad happens to us. Ⅱ A. We usually feel sad. B. I am a stranger. C. I ask my teacher to help me. D. Her father is ill. E. She is upset.
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举一反三
【简答题】在物理层上所传数据的单位是 ____ _____ ,英文写法是 ___ __ ____ 。
【单选题】Q: Will the man go dancing with the woman tonight?
A.
He will go in spite of the cold weather.
B.
He won't go since he is not feeling well.
C.
He will go when he feels better.
D.
D) He won't go as he hasn't finished his work.
【单选题】The man dancing with his wife now is the only one of the clerks in his office who _____invited to the palace ball.
A.
has
B.
have been
C.
has been
D.
have
【多选题】下列性质与卡托普利相符的是
A.
化学结构中含有两个手性中心
B.
化学结构中有巯基，有还原性，可发生自动氧化反应生成二硫化物
C.
用于抗心律失常
D.
用于抗高血压
E.
有大蒜臭味，室温时在水中可溶解
【单选题】物理层传输的是( )
A.
原始比特/物理帧
B.
分组
C.
信元
D.
帧 23、服务与协议是完全不同的两个概念,下列关于它们的说法错误的是( D) 。 A、协议是水平的,即协议是控制对等实体间通信的规则。服务是垂直的,即服务是下层向上层通过层间接口提供的。 B、在协议的控制下,两个对等实体间的通信使得本层能够向上一层提供服务。要实现本层协议,还需要使用下面一层所提供的服务。 C、协议的实现保证了能够向上一层提供服务。 D、OSI将层与层之间交换的数据单位称为协议数据单元PDU
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